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All of them are used in both Bengali and Assamese languages. The swôrôbôrnôs represent six of the seven main vowel sounds of Bengali, along with two vowel diphthongs. The Bengali script has a total of 9 vowel graphemes, each of which is called a স্বরবর্ণ swôrôbôrnô "vowel letter".
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Vowels & Consonant are used as alphabet and also diacritical marks.
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The Bengali script can be divided into vowels and vowel diacritics/marks, consonants and consonant conjuncts, diacritical and other symbols, digits, and punctuation marks.